CN216928079U - Medium-voltage cable - Google Patents

Abstract

The utility model relates to a medium-voltage cable, comprising three wire core groups on an inner layer, and a wrapping layer wrapped around the outer layer of the wire core groups. The three wire core groups are assembled into a triangular structure, and each wire core group includes a conductor And the inner core shielding insulating layer wrapped around the outside of the conductor, the wrapping layer is the cable core isolation layer, the explosion-proof layer group and the outer sheath sequentially from the inside to the outside, and the refractory material is filled between the wire core group and the wrapping layer. When in use, the above-mentioned medium voltage cable structure can ensure that the cable will not fuse within 90 minutes of the fire supply time under the rated working voltage and the flame temperature is not lower than 750 ℃, and it has the safe use of anti-interference, fire resistance, environmental protection, anti-static and explosion-proof. performance.

Description

A medium voltage cable

technical field

The utility model relates to the technical field of power cables, in particular to a medium-voltage cable, in particular to a high-tech antistatic explosion-proof medium-voltage cable.

Background technique

Static electricity is an objective natural phenomenon, which can be generated in many ways, such as contact, friction, peeling and so on. Electrostatic protection technologies, such as the electronic industry, semiconductor, petroleum industry, weapon industry, textile industry, rubber industry, and military fields, seek to reduce the loss caused by static electricity.

In the prior art, with the increasing use of industrial equipment, higher-performance voltages are required, and flame-retardant, fire-resistant, anti-static and explosion-proof medium-voltage cables are used more and more widely, and the current medium-voltage cables have certain defects. , especially in complex working conditions, the anti-static and explosion-proof effects are general, and it is easy to cause the cable to spontaneously ignite, causing unnecessary economic losses.

Therefore, for some working conditions with relatively high working current, or high temperature and relatively dry environments, there is an urgent need for a high-performance anti-static and explosion-proof medium-voltage cable that does not cause sparks.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide an improved medium-voltage cable, through the structural improvement, the medium-voltage cable has the safety performance of anti-interference, fire resistance, environmental protection, anti-static and explosion-proof.

In order to achieve the above purpose, the technical scheme of the present utility model is: a medium voltage cable, characterized in that: the medium voltage cable includes three core groups of an inner layer, and a wrapping layer wrapped around the outer layer of the core group, and the three Each core group is assembled into a triangular structure, and each core group includes a conductor and an inner core shielding insulating layer wrapped around the outside of the conductor. , refractory material is filled between the core group and the cladding layer.

Preferably, the inner core shielding insulating layer is a conductor shielding layer, an insulating layer, an insulating shielding layer, a copper tape shielding layer and a core isolation layer in sequence from the inside to the outside, and the surface of the core isolation layer is provided with several raised points; The copper conductor is pressed tightly, and the shielding layer of the copper tape is made of copper tape with a thickness of 0.1-0.12mm. The core isolation layer is made of double-layered non-woven fabric with a thickness of 0.1mm.

Further, the cable core isolation layer is made of high flame retardant wrapping tape, and the explosion-proof layer group includes a copper tape shielding explosion-proof layer and a steel tape armored explosion-proof layer. Thermal insulation water barrier tape layer and oxygen barrier layer.

Further, the copper tape shielding explosion-proof layer is made of 0.12mm thick brass tapes that overlap and wrap, and the width of the overlap between adjacent brass tapes is 0.5-1.5mm.

The ratio of the thickness of the thermal insulation and water blocking tape layer to the oxygen barrier layer is 1:2-5. The oxygen barrier layer is coated on the copper tape shielding explosion-proof layer with low-smoke halogen-free oxygen barrier material, and the thickness of the oxygen barrier layer is 1.8- 2.5mm.

Compared with the prior art, the technical solution of the present utility model includes improvements in many details in addition to the improvement of the overall technical solution. Specifically, it has the following beneficial effects:

1. In the improved scheme of the present utility model, the medium voltage cable includes three core groups in the inner layer, and a wrapping layer wrapped around the outer layer of the core group, and each core group includes a conductor and is wrapped outside the conductor. The inner core shielding insulating layer of the cable wrapping layer is the cable core isolation layer, the explosion-proof layer group and the outer sheath from the inside to the outside, and the refractory material is filled between the wire core group and the wrapping layer. Under the working voltage, when the flame temperature is not lower than 750 ℃, it will not fuse within 90 minutes of the fire supply time, and it has the safety performance of anti-interference, fire resistance, environmental protection, anti-static and explosion-proof;

2. In the technical solution of the present utility model, the conductor adopts a round compacted copper conductor, the copper tape shielding layer is wrapped with copper tape, the thickness is 0.1-0.12mm, and the wire core isolation layer is made of non-woven fabric with a thickness of 0.1mm. The cloth is double-layered and made of overlapping layers. The shielding layer can not only inhibit the external emission of electromagnetic waves, but also act as a channel for short-circuit current. flammable and explosive accidents;

3. In the structure of the utility model, the cable core isolation layer is made of high flame retardant wrapping tape, and the explosion-proof layer group includes copper tape shielding explosion-proof layer and steel tape armoring explosion-proof layer, copper tape shielding explosion-proof layer and steel tape armoring. Between the explosion-proof layers, there is a heat-insulating water-blocking tape layer and an oxygen-insulating layer, which have good fire resistance and heat insulation performance;

4. The structural design of the utility model is partially reasonable, and suitable fire-resistant and fire-resistant materials are selected, which not only meets the fire-resistant requirements of the cable, but also considers the material selection, structural size, and electrical performance, and at the same time achieves the purpose of reducing costs.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

Reference number:

1 conductor, 2 conductor shielding layer, 3 insulating layer, 4 insulating shielding layer, 5 copper tape shielding layer, 6 core isolation layer, 7 refractory material;

11 cable core isolation layer, 12 copper tape shielding explosion-proof layer, 13 thermal insulation water blocking tape layer, 14 oxygen barrier layer, 15 steel tape armored explosion-proof layer, 16 outer sheath.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The utility model provides a medium-voltage cable, specifically referring to FIG. 1, the difference from the prior art is that the medium-voltage cable includes three inner core groups, and a wrapping layer wrapped around the outer layer of the core group , the three core groups are assembled into a triangular structure. Each core group includes a conductor 1 and an inner core shielding insulating layer wrapped around the outside of the conductor. And the outer sheath 16, the refractory material 7 is filled between the core group and the wrapping layer.

In the implementation, the conductor 1 of the core group can be made of a round compacted copper conductor. Such a conductor has a compact structure. Under the same conductor cross-sectional area, the outer diameter of the conductor is reduced by about 10% after compression, thereby reducing the outer diameter of the product and facilitating installation. , laying. The conductor shielding layer 2, the insulating layer 3, and the insulating shielding layer 4 in the inner core shielding insulating layer are co-extruded with three layers, which can avoid the contamination of the insulating material in the process.

At the same time, a reinforcement layer can be set between the wire core group and the cladding layer. The reinforcement layer has a hexagonal structure, which is stable and impact-resistant. , In the case of deformation, it still maintains the effective operation of the cable. The high-performance anti-static explosion-proof medium-voltage cable with the above structure has the properties of anti-interference, fire resistance, environmental protection, anti-static and explosion-proof, and has a high degree of safety in use.

Example 1

The medium voltage cable includes three core groups on the inner layer, and a wrapping layer wrapped around the outer layer of the core group. The three core groups are assembled to form a stable triangular structure. The outer inner core shields the insulating layer, the wrapping layer is the cable core isolation layer, the explosion-proof layer group and the outer sheath sequentially from the inside to the outside, and the refractory material is filled between the wire core group and the wrapping layer.

Specifically, the inner core shielding insulating layer is, from inside to outside, the conductor shielding layer 2, the insulating layer 3, the insulating shielding layer 4, the copper tape shielding layer 5 and the core isolation layer 6, and the surface of the core isolation layer is provided with several Raised point; the conductor is made of round pressed copper conductor, the shielding layer of copper tape is wrapped with copper tape, the thickness is 0.1-0.12mm, the core isolation layer is made of double-layered non-woven fabric with thickness of 0.1mm. The coverage rate is not less than 20%. In order to increase the distribution stability of the three core groups, a felt strip can be set on the surface of the non-woven fabric of the core isolation layer to increase the coefficient of friction, maintain stability, absorb water and moisture, and prolong the service life of the cable. .

The conductor shielding layer 2, insulating layer 3, and insulating shielding layer 4 in the inner core shielding insulating layer are co-extruded in three layers. It is covered on the pressed conductor and adopts the extrusion production process, so that the three layers of materials are closely combined, and the secondary pollution of the insulating material is avoided at the same time, and the process quality of the product is guaranteed.

The copper tape shielding layer refers to a layer of 0.1-0.12mm copper tape that is overlapped and wrapped outside the insulating shielding layer to shield the electric field interference and balance the electric field. Allows ground fault current to pass.

Example 2

A medium-voltage cable, comprising three wire core groups on the inner layer, and a wrapping layer wrapped around the outer layer of the wire core group, the three wire core groups are assembled to form a triangular structure, and each wire core group includes a conductor and a wrapping layer. The inner core shielding insulating layer outside the conductor, the wrapping layer is the cable core isolation layer, the explosion-proof layer group and the outer sheath sequentially from the inside to the outside, and the refractory material is filled between the wire core group and the wrapping layer.

The refractory layer material is a mixture of aluminum hydroxide hydrate and sodium silicate in a certain proportion (the ratio of the two by mass is 1:4-8). Since the mixture contains a large amount of aluminum hydroxide hydrate, it will decompose at high temperature. A large amount of moisture forms water mist, which plays the role of cooling and fire prevention. While extruding the fireproof layer, wrap the cable core isolation layer, and wrap two layers of high flame-retardant tapes with a thickness of 0.2 mm at the same time after exiting the die to serve as the cable core isolation layer 11 .

Specifically, the explosion-proof layer group includes a copper tape shielding explosion-proof layer 12 and a steel tape armored explosion-proof layer 15, and a heat-insulating water-blocking tape layer 13 and an oxygen barrier layer are provided between the copper tape-shielding explosion-proof layer and the steel tape armored explosion-proof layer. 14. The copper tape shielding explosion-proof layer is made of a brass tape with a thickness of 0.12mm, and the width of the overlap between adjacent brass tapes is 0.5-1.5mm. The steel tape armored explosion-proof layer is wrapped on the oxygen barrier layer by means of two-layer gap overlap. According to different specifications, the thickness is selected from 0.5mm and 0.8mm steel tape. For single-core cables, use stainless steel strips; for three-core cables, use galvanized steel strips. Steel tape armor, one is that it can be explosion-proof and impact-resistant, and the other is that it can block flames. The explosion-proof layer can shield the electric field to prevent the impact on the environment, and can also be used for grounding to guide the leakage current to the ground to avoid safety accidents.

The ratio of the thickness of the thermal insulation and water blocking tape layer to the oxygen barrier layer is 1:2-5. The oxygen barrier layer is coated on the copper tape shielding explosion-proof layer with low-smoke halogen-free oxygen barrier material, and the thickness of the oxygen barrier layer is 1.8- 2.5mm. The material is a low-smoke halogen-free oxygen-insulating material, and the oxygen index of the material is not less than 45. Since the material is filled with a large amount of hydrated metal oxides, when heated, the water molecules evaporate and absorb most of the heat, which can reduce the temperature of the cable, and the formed water molecules can be Dilute the concentration of oxygen around the cable, and the burning metal oxide product forms a hard shell, which is wrapped outside the cable core, preventing the spread of flame and heat to the inside of the cable, and the oxygen barrier layer acts as an isolation sleeve. The outer sheath 16 is extruded on the fireproof layer by means of extrusion, with a thickness of 2.5-5.0 mm. According to different needs, anti-PVC or low-smoke halogen-free sheathing materials can be selected, and antistatic agents are added to the sheathing materials to prevent electrostatic sparks during installation and use. The outer sheath provides protection.

The above content is a further detailed description of the present invention in conjunction with the specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to the above-mentioned descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (4)

1. A medium-voltage cable, characterized in that: the medium-voltage cable comprises three core groups of an inner layer, and a wrapping layer wrapped around the outer layer of the core group, and the three core groups are assembled to form a triangular structure, and each The core group includes a conductor and an inner core shielding insulating layer wrapped around the outside of the conductor. The wrapping layer is the cable core isolation layer, the explosion-proof layer group and the outer sheath from the inside to the outside. The core group and the wrapping layer are filled with There are refractory materials; the inner core shielding insulating layer is conductor shielding layer, insulating layer, insulating shielding layer, copper tape shielding layer and core isolation layer from inside to outside, and the surface of the core isolation layer is provided with several raised points; the conductor adopts The round compacted copper conductor, the copper tape shielding layer is wrapped with copper tape, the thickness is 0.1-0.12mm, the core isolation layer is made of 0.1mm thick non-woven fabric double-layer overlapping; the cable core isolation layer is made of high It is made of flame retardant wrapping tape, and the explosion-proof layer group includes copper tape shielding explosion-proof layer and steel tape armored explosion-proof layer. oxygen layer. 2. A medium voltage cable according to claim 1, characterized in that: the copper tape shielding explosion-proof layer is formed by wrapping a brass tape with a thickness of 0.12 mm, and the adjacent brass tapes are overlapped with a cover. The width is 0.5-1.5mm. 3. a kind of medium voltage cable according to claim 1 is characterized in that: the ratio of the thickness of the thermal insulation water-blocking tape layer and the oxygen barrier layer is 1:2-5, and the oxygen barrier layer adopts low-smoke halogen-free oxygen barrier The material is coated on the copper tape shielding explosion-proof layer, and the thickness of the oxygen barrier layer is 1.8-2.5mm. 4 . The medium voltage cable according to claim 1 , wherein the thickness of the outer sheath is 2.5-5 mm. 5 .

Images